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Signs
Flat
Audio and Video Controls
Close, cancel, Error
IndianRed
512x512
Essential Collection
signs, Error, prohibition
Computer Security
Error, warning, signs
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Snowish
wrong, Alert, warning
128x128
Iconza
Alert, exclamation, warning
32x32
Error, wrong, warning
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Dropline Nuovo!
Gaim, warning, wrong
64x64
Vaga
warning, wrong, exclamation
16x16
Radium Neue
exclamation, warning, wrong
256x256
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Signs & symbols
Circle Icons
Attention, danger, Caution
Music & multimedia
Smooth
Gakuseisean
Error
UI
Dialog, Error
Pixel